/*
* INSANE - Interactive Structural Analysis Environment
*
* Copyright (C) 2003-2005
* Universidade Federal de Minas Gerais
* Escola de Engenharia
* Departamento de Engenharia de Estruturas
* 
* Author's email :    insane@dees.ufmg.br
* Author's website :  http://www.dees.ufmg.br/insane
* 
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or any later version.
* 
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* 
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/
package br.ufmg.dees.insane.ui.rich.learn.learn_view.command;
import java.util.ArrayList;
import java.util.ListIterator;

import javax.swing.JFrame;

import br.ufmg.dees.insane.ui.rich.learn.learn_controller.Controller;
import br.ufmg.dees.insane.ui.rich.learn.learn_view.LearnInterface;

/**
 *
 * @author Fonseca, Flavio & Pitangueira, Roque
 * @since March 2004
 */
public class DeleteCommand implements Command, Cloneable {
    
    private LearnInterface parent;
    private Controller controller;
    private ArrayList shps;
    
//*****************************************************************************
	
    /** Creates new DeleteCommand */
    public DeleteCommand(JFrame parent) {
        this.parent = (LearnInterface)parent;
    }
    
//*****************************************************************************
	
	/** Execute method. */
    public void execute() {
        controller = this.parent.getView().getController();
        if (controller.isSelected()) {
            shps = (ArrayList)controller.removeSelection();
            parent.getView().getDrawingArea().repaint();
            parent.getView().addToUndo((Command)this.clone());
        }
    }
    
//*****************************************************************************
	
	/** Undo method. */
    public void undo() {
        ListIterator sh = shps.listIterator();
        while (sh.hasNext()) {
            controller.add(sh.next());
        }
    }
    
//*****************************************************************************
	
    /**
     * Impossible to redo - Not implemented.
     */
    public void redo() {}
    
    public Object clone() {
        try {
            DeleteCommand cmd = (DeleteCommand)super.clone();
            cmd.shps = (ArrayList)shps.clone();
            return cmd;
        } catch (CloneNotSupportedException e) {
            throw new Error("Clonning ERROR - This should never happen!");
        }
    }
    
//*****************************************************************************
}

